anticlinorium

In structural geology, an anticline is a fold that is convex up or to the youngest beds. On a geologic map, anticlines are usually recognized by a sequence of rock layers that are progressively older toward the center of the fold because the uplifted core of the fold is preferentially eroded to a deeper stratigraphic level relative to the topographically lower flanks. The strata dip away from the center, or crest, of the fold.
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(n.)
The upward elevation of the crust of the earth, resulting from a geanticlinal.